Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2026	Dec. 31, 2025
Equity Securities [Line Items]
Total equity securities not held for trading	$ 41,126	$ 40,932
Not held for trading [Member]
Equity Securities [Line Items]
Equity securities at fair value	1,765	2,008
Equity Securities Textual [Abstract]
Contractual lock-up period restriction for sale	295	218
Federal Reserve Bank Stock	3,500	3,500
Federal Home Loan Bank Stock	1,400	762
Not held for trading [Member] \| Tax credit investments [Member]
Equity Securities [Line Items]
Equity securities, not carried at fair value	21,102	21,395
Not held for trading [Member] \| Affordable housing tax credit investments [Member]
Equity Securities [Line Items]
Equity securities, not carried at fair value	11,300	11,600
Not held for trading [Member] \| Renewable energy tax credit investments [Member]
Equity Securities [Line Items]
Equity securities, not carried at fair value	9,600	9,600
Not held for trading [Member] \| Renewable energy tax credit investments [Member] \| Accounting method, investment tax credit, deferral
Equity Securities Textual [Abstract]
Deferred investment tax credit	(1,800)	(1,700)
Not held for trading [Member] \| Private equity [Member]
Equity Securities [Line Items]
Equity securities, not carried at fair value	13,304	13,206
Not held for trading [Member] \| Federal Reserve Bank stock and other at cost [Member]
Equity Securities [Line Items]
Equity securities, not carried at fair value	4,955	4,323
Not held for trading [Member] \| Other method investments - Private equity [Member]
Equity Securities [Line Items]
Equity securities, not carried at fair value	$ 9,800	$ 9,800

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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